For a limited resource, two closely related species compete for the same resource, which is known as $.........$, which keeps them in check in the environment.

Pollinator mutualism are special interactions involving ...$A$...,which receive food or a place to lay eggs and ...$B$...,which receive pollen from others of their kind. Choose the correct option for $A$ and $B$.

Which type of interaction is seen between sea anemone and clown fish?

Identify the correct adaptations of parasites from the following list:
$a.$ Loss of unnecessary sense organs
$b.$ Presence of adhesive organs
$c.$ Presence of suckers
$d.$ High reproductive capacity
$e.$ Well-developed digestive system
Choose the correct option with respect to parasites.

Predators also help in $A$ species diversity in a community,by $B$ the intensity of competition among competing prey species. Here $A$ and $B$ can be

Match the following population interactions with their respective signs and descriptions:

Interaction Type	Sign	Description
$(a)$ Parasitism	$(i) -, 0$	$(A)$ Both get benefitted
$(b)$ Amensalism	$(ii) -, -$	$(B)$ One gets harmed,other has no effect
$(c)$ Competition	$(iii) +, -$	$(C)$ Both get harmed
$(d)$ Mutualism	$(iv) +, +$	$(D)$ One is harmed and second is benefited